Automatic gas-supply controlling means



March 23 1926.

J. B.'ALL|NGTQN ETAL. AUTOMATIC LGAS SUPPLY CONTROLLING MEANS Filed Nov. 9', 1922 Patented Mar. 23, 1926.

UNITED STATES 1,577,511 PATENT OFFICE.

JOHN B. ALLINGTON AND GEORGE S. DADY, OF ROCHESTER, NEW YORK.

AUTOMATIC GAS-SUPPLY CONTROLLING MEAN S.

Application filed Novepiber 9, 1922. Serial No. 599,780.

To all whom it may concern.

lie it known that we, JOHN B. ALLINGTON and Guoaen S. Dam, citizens of the United States, and residents of Rochester, in the county of Monroe and State of New York, have invented certain new and useful Improvements in Automatic Gas-Supply Controlling Means, of which the following is a specification.

The present invention relates to an automatic gas supply controlling means and more particularly to the type of gas supply for burners, and the like where the gas and air, both under pressure, are mixed in a mixing chamber before reaching the burner or other gas consuming devices. An object of this invention is to provide a construction in which the as cannot pass to the mixing chamber until the air has passed to said chamber and in which the gas will cease to flow when the air supply stops or becomes reduced in pressure below a certain amount.-

Another object of this invention is to provide an automatic gas supply control in which the gas supply will be cut off when pressure is built up in the'mixing chamber by the air tending to back up in the gas supply.

To these and other ends, the invention consists of certain arts and combinations of parts, all of which will be hereinafter described, the novel features being pointed out in the appended claims.

In. the drawings:

Fig. 1 is a side elevation ofa gas furnace, showing the automatic gas supply controlling means connected therewith;

Fig. 2 is a sectional view through the mixing device;

Fig. 3 is a sectional view through the gas supply valve, showing the manner in which said valve is controlled by the air supply, and

Fig. 4 is a fragmentary sectional View of the automatic gas supply controlling means.

Referring more particularly to the drawings, 1 indicates an oven furnace heated by gas burners 2 connected to a manifold 3, which has at its inlet a mixing T or chamber 4. This mixing T, as shown in Fig. 1,

.has an outlet 5 connected to the manifold,

an inlet 6 connected with a gas supply pipe 7 and an inlet 8 connected with an air supply pipe. 9. In the gas supply pipe 7, a valve casing 10 is arranged having an inlet 1'] and an outlet 12 at right angles to the inlet, a partition 13 being provided in the chamber with an opening 14, closed by a valve member 15 on the valve stem 16.

\Vith the end in view of controlling the valve member 15 from the air supply, a chamber is provided formed by two castings l7 and 18, the casting 17 being secured to the valve casing 10, these two castings having, respectively, openings 19 and 20 closed by a diaphragm 21 to which the valve stem 16 is secured. Arranged in the chamber formed by the two castings 17 and 18 is a member preferably'formed by a diaphragm 22, which is connected to the stem 16 by a head '23 and forms in the chamber two spaces 24 and 25 on opposite sides of the diaphragm. A disk 26 is secured to the head 23 on the opposite side of the diaphragm in order to support the latter throughout the greater portion of its area The air pipe 9 has a connection 27 with the chamber space 25 so that the prcssure of the air in the air pipe, which is greater than the gas pressure tends to hold the valve 15 in an open position and. as a consequence, as

long as the air is delivered by way of the nozzle 28 into the mixer 4, the gas Valve will remain open, but as soon as the air pressure in the air supply pipe 9 is reduced below a certain amount or stops, then the valve 15 will close, due to the weight of said valve and the parts connected therewith and the pressure of the gas upon the d igp,hragm 21'.

This valve will remain closed until the pres- ,means is provided which will effect the automatic closing of the gas supply valve upon the building up of pressure in the mixing chamber or manifold. ThlS means, in this instance, embodies a piping 29 connected with the mixing chamber and also connected with the chamber space 24 above the diaphragm 22. It. is apparent that as soon as the pressure builds up in the mixing chamber or manifold, this pressure will be communicated by the piping 29 to the space 24 above the diaphragm 22, thus equalizing the pressure on both"faces of the diaphragm 22 and permitting the valve 15 to close under its weight through the gas presure on the diaphragm 21.

From the forgoing it will be seen that there has been provided a construction in which in the event of the failure or reduction of the air supply below a certain pressure, the gas supply will be automatically cut off until the air supply is started or increased in pressure. It will also be seen that in the event the burner manifold pressure builds up to a point that it will back up in the gas supply, the gas will automatically be cut oil. These results are efl'ected through a valve in the gas supply, which tends to close by gravity and is held open by pressure in the air supply. A connection is provided between the mixing chamber or burner manifold and the face of the member that is opposite the one acted upon by the pressure of the air supply. so that when a pressure builds up in the manifold due to the stoppage of the burners or other causes, the pressure on said member will be balanced and the valve will close under the action of gravit-iy assisted by the pressure of the gas sup- P .Y-

Nhat we claim as our invention and desire to secure by Letters Patent is:

In combination with a gas supply, a valve controlling said gas supply and movable under the action of gravlty to closed position, an air su ply of greater pressure than the gas supp y, a mixing chamber with which said gas supply and said air supply connect, a pressure operated member controlling said valve for the gas sup-ply, means providing communication between one side of the pressure operated member and the air supply to effect the opening of the gas supply valve, the cross sectional area of such communicat ing means being smaller than the cross sectional area of the gas supply, so that the pressure operated member is operated through the static head of the air line, means providing communication between the opposite face of the pressure member and the mixing chamber, the cross sectional area of said means being smaller than the cross sectional area of the mixing chamber at the point where said means communicates with the mixing chamber, whereby the reduction of the pressure in the air supply below the pressure of the gas supply efi'ects the cutting off of the gas supply and the building up of pressure in the mixing chamber due to interference with the flow from the mixing chamber will cut off the gas supply.

JOHN B. ALLINGTON. GEORGE S. DADY. 

